Focal Length Using Cropped Sensor Cameras
Yes, I if you set the sensor size to the Nikon DX preset, the field of view should be the same as a real camera. The field of view is computed from the dimensions of the sensor and the length of the lens, as is in the real world.

A 75mm lens on a full sensor camera (24x36mm sensor size) would cover a field of view of 26.9 degrees.

A 50mm lens on an APS size sensor (23.6x15.8mm) would cover afield of view of 26.6 degrees.

Remember that the 1.5 factor in real life is "approximate". The exact match for a 75mm lens would be a 49.34mm lens.